According to cisco
http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r2.0/multicast/command/reference/3mrigmp.html
The designated router for a LAN is the only router that sends IGMP host-query messages:
•For IGMP Version 1, the designated router is elected according to the multicast routing protocol that runs on the LAN.
•For IGMP Versions 2 and 3, the designated querier is the highest IP-addressed multicast router on the subnet.
If the router hears no queries for the timeout period (controlled by the query-timeout command), it becomes the querier
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